Extraordinary refractive properties of photonic crystals of metallic nanorods

Tserkezis, Christos; Stéfanou, N.; Papanikolaou, N.

doi:10.1364/josab.27.002620

Cited by 11 publications

(6 citation statements)

References 58 publications

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“…Pendry and collaborators were early pioneers in designing electromagnetic metamaterials using patterned sub-wavelength standing cylindrical structures [12,13]. Since then, these studies have inspired numerous researchers to realize nanoscale structural analogs, such as silver nanowires [14], doped silicon nanowires [15], and other metallic nanorods [16,17]. The optical anisotropy in such nanowire arrays was identified as a mechanism for negative refraction [18,19].…”

Section: Introductionmentioning

confidence: 99%

Negative refraction and self-collimation in the far infrared with aligned carbon nanotube films

Zhang

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Introductionmentioning

confidence: 99%

Negative refraction and self-collimation in the far infrared with aligned carbon nanotube films

Zhang

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…These modes can be tuned within a broad range of frequencies by changing the geometrical characteristics and the dielectric environment of the nanorods [32][33][34]. Periodic arrays of aligned nanorods, arranged perpendicular to a substrate, can be fabricated with chemical or lithographic methods [35][36][37][38][39] and find numerous applications in surface enhanced Raman scattering [40], biosensing [41], polarization filtering [42], superlensing [43], or as systems exhibiting extraordinary refractive properties, such as negative refraction and self= collimation [44][45][46]. It has also been shown that, when the nanorods approach each other in a two-dimensional (2D) array, the EM field is concentrated in the interstitial region [47] and longitudinal standing waves are formed in the dielectric space between the rods [48], similarly to plasmonic cavity resonators.…”

Section: Introductionmentioning

confidence: 99%

Calculation of waveguide modes in linear chains of metallic nanorods

Tserkezis¹,

Stéfanou²

2012

J. Opt. Soc. Am. B

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We report on the calculation of the fundamental plasmon waveguide modes in linear periodic chains of finite silver nanorods, aligned perpendicular to the chain. The results of rigorous full-electrodynamic calculations by the layer-multiple-scattering method are discussed in conjunction with the results of the widely used coupled-dipole model and a critical evaluation of the latter is provided. More specifically, it is shown that both diameter and height of the nanorods must be much smaller than the interparticle distance; otherwise, for relatively long nanorods close to each other, the coupled-dipole model can fail completely to predict the waveguide dispersion diagram. Moreover, the model systematically underestimates the effect of dissipative losses and cannot describe the effect of a supporting substrate, which is always present in realistic cases and induces considerable changes in the waveguide dispersion diagram.

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“…The normals in Fig. 1e point towards q x axis (rather than away from it) as the plasmon frequency increases along this direction [52,53](see also Fig. S2 in SM [54]).…”

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confidence: 99%

Switchable and unidirectional plasmonic beacons in hyperbolic two-dimensional materials

et al. 2019

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In hyperbolic 2D materials, energy is channeled to their deep subwavelength polaritonic modes via four narrow beams. Here we consider the launching of surface polaritons in the hyperbolic 2D materials and demonstrate that efficient uni-directional excitation is possible with an elliptically polarized electric dipole, with the optimal choice of dipole ellipticity depending on the materials optical constants. The selection rules afforded by the choice of dipole polarization allow turning off up to two beams, and even three if the dipole is placed close to an edge. This makes the dipole a directionally switchable beacon for the launching of sub-difractional polaritonic beams, a potential logical gate. We develop an analytical approximation of the excitation process which describes the results of the numerical simulations well and affords a simple physical interpretation.3D hyperbolic materials, i.e., strongly anisotropic materials that have metallic-type response along one of the optical axes and dielectric-type response along the other two (or vice versa), have recently attracted a lot of attention [1][2][3][4][5]. These materials support propagation of subdiffractional waves over long distances, and are promising for applications such as waveguiding, [6-9], hyperlensing and focusing [10,11], negative refraction [12], and enhancement of dipole-dipole interactions between emitters [13][14][15]. Recently, the existence of 2D hyperbolic materials and metasurfaces, supporting in-plane hyperbolicity, was theoretically proposed [16][17][18][19][20] and demonstrated experimentally [21][22][23]. Particularly, characteristics of the surface hyperbolic polaritons in a natural vdW material, α-MoO 3 , have been measured [21,22]. Moreover, a hyperbolic metasurface was implemented in GHz frequency range using anisotropic metallic crosses printed on a dielectric substrate [23].2D hyperbolic materials are of particular interest as they support propagation of surface polaritons that carry energy in the form of four narrow rays [16][17][18], as can be seen in Fig. 1a. This allows for efficient channeling of the signal from the source toward the desired target, which is crucial for the nanophotonics and applications in such fields as communication, computing, energy and quantum information. The advent of novel low loss 2D hyperbolic platform could present a paradigm shift in how energy can be steered. Typically, however, only one ray (connecting source and target) carries a signal, while the other three siphon energy away from the source. Thus it is highly desirable to develop an efficient way for the uni-directional excitation of the hyperbolic polaritons.There are two broad approaches that can be used to mitigate the problem. The first one involves nonreciprocal materials that support uni-directional polari-tonic modes that can only propagate along a given set of directions. This includes magnetoplasmons [24][25][26][27] in systems subjected to a strong static magnetic field, chiral plasmons in systems with non-zero Berry curvature...

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Extraordinary refractive properties of photonic crystals of metallic nanorods

Cited by 11 publications

References 58 publications

Negative refraction and self-collimation in the far infrared with aligned carbon nanotube films

Negative refraction and self-collimation in the far infrared with aligned carbon nanotube films

Calculation of waveguide modes in linear chains of metallic nanorods

Switchable and unidirectional plasmonic beacons in hyperbolic two-dimensional materials

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